26256317905 has 4 divisors (see below), whose sum is σ = 31507581492. Its totient is φ = 21005054320.

The previous prime is 26256317887. The next prime is 26256317929. The reversal of 26256317905 is 50971365262.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10220401216 + 16035916689 = 101096^2 + 126633^2 .

It is not a de Polignac number, because 26256317905 - 2⁹ = 26256317393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2625631786 + ... + 2625631795.

It is an arithmetic number, because the mean of its divisors is an integer number (7876895373).

Almost surely, 2^26256317905 is an apocalyptic number.

It is an amenable number.

26256317905 is a deficient number, since it is larger than the sum of its proper divisors (5251263587).

26256317905 is an equidigital number, since it uses as much as digits as its factorization.

26256317905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251263586.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 26256317905 in words is "twenty-six billion, two hundred fifty-six million, three hundred seventeen thousand, nine hundred five".